the SFE was more of a rescue than a buy. It came from my boys neglected SW tank. He was only getting fed once a week and in water with detectable ammonia and nitrate cuz the guy never took care of it. Since I got him he eats 1-2 silversides, or shrimp a day. He shoud be fine in my tank for some time. I dont even have a lid and the eel never really swims the top. It is my belief if u have plenty of hiding places and feed it regular the eels will not attempt to get out. Thanks for the comments. The FOWLR is still a work in progress, honestly keeping fish only is a way bigger challenge than a reef tank. Corals dont really try to kill eachother or carry disease or create waste like fish do. Corals are the easy part.